Need to know what engine it has.
If you want to locate a new egr valve, check with your local auto parts store. If you want to know where the egr valve is located on your vehicle, post the year and engine size of your S10.
There is no EGR valve on the 2002 4.3L (code W)
It depends if it is a 4.3 or the 2.2 engine but, in general the EGR valve is located on the intake manifold.
The Exhaust Gas Recirculation Valve on a 1989 S10 is located in the valve cover. It is toward the front of the motor.
There is no egr valve on that vehicle.
There are some model 2002 Trailblazers that do not have an EGR valve installed. If your vehicle does have an EGR valve it would be located on the top right side of the engine behind the intake air valve.
there is no such thing as an egr position sensor
What engine???
There are several relays on that vehicle. We need to know which one you are looking for.
Need to know what year the vehicle is.
this egr valve is a PCM (powertrain control module) controled pintle at the intake manifold. there is a thin tube running from the exhaust manifold around the firewall side of the engine to the EGR module?, this isn't a vacuum/sileniod controled EGR. It is a Linear control system, the pintle allows exhaust gas to flow based on the VSS(vehicle speed sensor) IAT(?) and coolant temperature sensor.Good luck
2003 4.3's do not have an egr valve.